Table of Content 4.1 Thermionic Emission and Cathode Ray 4.2 Carthode Ray Oscilloscope 4.3 Semiconductor 4.4 Semiconductor Diode 4.5 Trasistor 4.6 Logic Gate

# Transistors

The SPM Physics Workbook is developed under the One-School.net Free Books Project. The content of this book is strictly follow Malaysia SPM (Sijil Pelajaran Malaysia) syllabus. The aim of this project is to provide a complete electronic supplementary network for students to develop self-learning skills by breaking the spoon-feed rituals and to encourage them to compile educational information from the Internet.

1) The transistor in the diagram is a _______ transistor.

 pnp npn amplifying auto switch

2) The potential of terminal C should be ________ when it is connected to a circuit.

 positive negative neutral

3) Which of the following is not true regarding the transistor circuit in the diagram?

 The emitter-base diode is forward bias. The collector-base diode is reverse bias. The resistance of the transistor will be very low if S1 is switched on. The resistance of the transistor will increase when switch S2 is switched on.

4) The diagram shows a transistor circuit. Which of the following is true about the current I1, I2 and I3?

 I1 = I2 = I3 I1 < I3 < I2 I1 = I3 , I3 < I2 I2 < I1 < I3

5) The diagram shows a transistor being used as a current amplifier. The current I1 will increase when

 The current I2 increase. The current I2 decrease. The current I3 increase. The current I3 decrease.

6) The resistance of a LDR will _________ when the surrounding is bright.

 increase decrease remian unchange

7) The diagram shows a circuit of an automatic switch. The bulb will light up when

 the surrounding is bright. the surrounding is dark. the surrounding is cool. the surrounding is hot.

8) The diagram shows a circuit of an automatic switch. What is the function of the 1kW resistor?

 To limit the base current. To limit the collector current. To limit the emitter current. To limit the resistance in the transistor.